ELECTRONICALLY CONTROLLED BRAKE SYSTEM TC and CG Terminal Circuit

DESCRIPTION

Connecting terminals TC and CG of the DLC3 causes the ECU to display the DTC by blinking the ABS warning light, brake warning light / yellow (minor malfunction), slip indicator light and/or brake hold stand by indicator light.

WIRING DIAGRAM

A000X8EE05
*a CAN Communication Line (Braking and Driving Bus)
*b CAN Communication Line (V Bus)
*c Hybrid Vehicle Control ECU
*d Skid Control ECU

CAUTION / NOTICE / HINT

Note

When replacing the skid control ECU, perform the following operations:


  • Initialization of linear solenoid valve and calibration Click here.

  • Yaw rate and acceleration sensor zero point calibration Click here.

PROCEDURE


  1. INSPECT DLC3 (TC AND CG TERMINAL)


    1. A000UQ5E01
      *1 Front view of DLC3:

      Turn the power switch ON (IG).

    2. Measure the voltage according to the value(s) in the table below.

      Standard voltage
      Tester Connection Switch Condition Specified Condition
      L31-13 (TC) - Body ground Power switch ON (IG) 11 to 14 V

    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance
      Tester Connection Condition Specified Condition
      L31-4 (CG) - Body ground Always Below 1 Ω

    NG

    CHECK HARNESS AND CONNECTOR (DLC3 - HYBRID VEHICLE CONTROL ECU) Click here

    OK

  2. CHECK CAN COMMUNICATION SYSTEM


    1. for LHD:

      Check if the CAN communication system DTC is output Click here.

      for RHD:

      Check if the CAN communication system DTC is output Click here.

      Result
      Result Proceed to
      DTC is not output A
      DTC is output for LHD B
      for RHD C

      Tech Tips

      If troubleshooting has been carried out according to the "PROBLEM SYMPTOMS TABLE", refer back to the table and proceed to the next step before replacing the part Click here.


    B

    GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) Click here

    C

    GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) Click here

    A

  3. CHECK HARNESS AND CONNECTOR (DLC3 - HYBRID VEHICLE CONTROL ECU)


    1. Disconnect the A77 ECU connector.

      A000VM3E01
      Front view of DLC3
      *1 Front view of wire harness connector: (to Hybrid Vehicle Control ECU)

    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance
      Tester Connection Condition Specified Condition
      L31-13 (TC) - A77-24 (TC) Always Below 1 Ω
      L31-13 (TC) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK HARNESS AND CONNECTOR (DLC3 - BODY GROUND)


    1. A000YZYE01
      *1 Front view of DLC3:

      Measure the resistance according to the value(s) in the table below.

      Standard resistance
      Tester Connection Condition Specified Condition
      L31-4 (CG) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. CHECK HYBRID VEHICLE CONTROL ECU (DLC3 INPUT)


    1. A000UQ5E01
      *1 Front view of DLC3:

      Using SST, connect terminals 13 (TC) and 4 (CG) of the DLC3.

      SST
      09843-18040

    2. Check if the ABS warning light is blinking.

      Result
      Result Proceed to
      ABS warning light is blinking A
      ABS warning light is not blinking B

    B

    REPLACE HYBRID VEHICLE CONTROL ECU Click here

    A

  6. CHECK CAN COMMUNICATION SYSTEM


    1. for LHD:

      Check if the CAN communication system DTC is output Click here.

      for RHD:

      Check if the CAN communication system DTC is output Click here.

      Result
      Result Proceed to
      DTC is not output for LHD A
      for RHD B
      DTC is output for LHD C
      for RHD D

      Tech Tips

      If troubleshooting has been carried out according to the "PROBLEM SYMPTOMS TABLE", refer back to the table and proceed to the next step before replacing the part Click here.


    A

    REPLACE SKID CONTROL ECU Click here

    B

    REPLACE SKID CONTROL ECU Click here

    C

    GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) Click here

    D

    GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) Click here